Is it necessary to use xlib's “XAllocSizeHints()”?

Question

Xlib has a function called XAllocSizeHints to allocate a XSizeHints structure on the heap and set it to zero.

XSizeHints *sizehints;
sizehints=XAllocSizeHints();

However, is it necessary to always use this function? Or can I do this:

XSizeHints sizehints;
memset(&sizehints, 0, sizeof(XSizeHints));

I would like to know if it is possible to avoid XAllocWMHints and XAllocClassHint too.